Hi guys,

This weekend I broke open what very much seemed to be an original Shimano package labeled "Shiman SIS shifter cable set", which to my surprise contained spiral-wound outer cables.
I've always thought that for SIS shifting the cable sheaths with the lenghtwise strands were pretty much a must.
So what's this?
- is there a Shimano spiral cable that is SIS compatible and which I've simply haven't heard of before?
- have I been ripped off and bought some counterfeit/embarrassingly old stuff?
- Was the lengthwise strands for shifters not that required actually?

So basically, can I use it with no detriment, can I use it with some degradation of performance, or should I get some new cable and leave this aside?